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TOMOYO Linux Cross Reference
Linux/net/ipv6/af_inet6.c

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  1 /*
  2  *      PF_INET6 socket protocol family
  3  *      Linux INET6 implementation
  4  *
  5  *      Authors:
  6  *      Pedro Roque             <roque@di.fc.ul.pt>
  7  *
  8  *      Adapted from linux/net/ipv4/af_inet.c
  9  *
 10  *      Fixes:
 11  *      piggy, Karl Knutson     :       Socket protocol table
 12  *      Hideaki YOSHIFUJI       :       sin6_scope_id support
 13  *      Arnaldo Melo            :       check proc_net_create return, cleanups
 14  *
 15  *      This program is free software; you can redistribute it and/or
 16  *      modify it under the terms of the GNU General Public License
 17  *      as published by the Free Software Foundation; either version
 18  *      2 of the License, or (at your option) any later version.
 19  */
 20 
 21 
 22 #include <linux/module.h>
 23 #include <linux/capability.h>
 24 #include <linux/errno.h>
 25 #include <linux/types.h>
 26 #include <linux/socket.h>
 27 #include <linux/in.h>
 28 #include <linux/kernel.h>
 29 #include <linux/timer.h>
 30 #include <linux/string.h>
 31 #include <linux/sockios.h>
 32 #include <linux/net.h>
 33 #include <linux/fcntl.h>
 34 #include <linux/mm.h>
 35 #include <linux/interrupt.h>
 36 #include <linux/proc_fs.h>
 37 #include <linux/stat.h>
 38 #include <linux/init.h>
 39 #include <linux/slab.h>
 40 
 41 #include <linux/inet.h>
 42 #include <linux/netdevice.h>
 43 #include <linux/icmpv6.h>
 44 #include <linux/netfilter_ipv6.h>
 45 
 46 #include <net/ip.h>
 47 #include <net/ipv6.h>
 48 #include <net/udp.h>
 49 #include <net/udplite.h>
 50 #include <net/tcp.h>
 51 #include <net/ipip.h>
 52 #include <net/protocol.h>
 53 #include <net/inet_common.h>
 54 #include <net/route.h>
 55 #include <net/transp_v6.h>
 56 #include <net/ip6_route.h>
 57 #include <net/addrconf.h>
 58 #ifdef CONFIG_IPV6_TUNNEL
 59 #include <net/ip6_tunnel.h>
 60 #endif
 61 
 62 #include <asm/uaccess.h>
 63 #include <asm/system.h>
 64 #include <linux/mroute6.h>
 65 
 66 MODULE_AUTHOR("Cast of dozens");
 67 MODULE_DESCRIPTION("IPv6 protocol stack for Linux");
 68 MODULE_LICENSE("GPL");
 69 
 70 /* The inetsw6 table contains everything that inet6_create needs to
 71  * build a new socket.
 72  */
 73 static struct list_head inetsw6[SOCK_MAX];
 74 static DEFINE_SPINLOCK(inetsw6_lock);
 75 
 76 struct ipv6_params ipv6_defaults = {
 77         .disable_ipv6 = 0,
 78         .autoconf = 1,
 79 };
 80 
 81 static int disable_ipv6_mod = 0;
 82 
 83 module_param_named(disable, disable_ipv6_mod, int, 0444);
 84 MODULE_PARM_DESC(disable, "Disable IPv6 module such that it is non-functional");
 85 
 86 module_param_named(disable_ipv6, ipv6_defaults.disable_ipv6, int, 0444);
 87 MODULE_PARM_DESC(disable_ipv6, "Disable IPv6 on all interfaces");
 88 
 89 module_param_named(autoconf, ipv6_defaults.autoconf, int, 0444);
 90 MODULE_PARM_DESC(autoconf, "Enable IPv6 address autoconfiguration on all interfaces");
 91 
 92 static __inline__ struct ipv6_pinfo *inet6_sk_generic(struct sock *sk)
 93 {
 94         const int offset = sk->sk_prot->obj_size - sizeof(struct ipv6_pinfo);
 95 
 96         return (struct ipv6_pinfo *)(((u8 *)sk) + offset);
 97 }
 98 
 99 static int inet6_create(struct net *net, struct socket *sock, int protocol,
100                         int kern)
101 {
102         struct inet_sock *inet;
103         struct ipv6_pinfo *np;
104         struct sock *sk;
105         struct inet_protosw *answer;
106         struct proto *answer_prot;
107         unsigned char answer_flags;
108         char answer_no_check;
109         int try_loading_module = 0;
110         int err;
111 
112         if (sock->type != SOCK_RAW &&
113             sock->type != SOCK_DGRAM &&
114             !inet_ehash_secret)
115                 build_ehash_secret();
116 
117         /* Look for the requested type/protocol pair. */
118 lookup_protocol:
119         err = -ESOCKTNOSUPPORT;
120         rcu_read_lock();
121         list_for_each_entry_rcu(answer, &inetsw6[sock->type], list) {
122 
123                 err = 0;
124                 /* Check the non-wild match. */
125                 if (protocol == answer->protocol) {
126                         if (protocol != IPPROTO_IP)
127                                 break;
128                 } else {
129                         /* Check for the two wild cases. */
130                         if (IPPROTO_IP == protocol) {
131                                 protocol = answer->protocol;
132                                 break;
133                         }
134                         if (IPPROTO_IP == answer->protocol)
135                                 break;
136                 }
137                 err = -EPROTONOSUPPORT;
138         }
139 
140         if (err) {
141                 if (try_loading_module < 2) {
142                         rcu_read_unlock();
143                         /*
144                          * Be more specific, e.g. net-pf-10-proto-132-type-1
145                          * (net-pf-PF_INET6-proto-IPPROTO_SCTP-type-SOCK_STREAM)
146                          */
147                         if (++try_loading_module == 1)
148                                 request_module("net-pf-%d-proto-%d-type-%d",
149                                                 PF_INET6, protocol, sock->type);
150                         /*
151                          * Fall back to generic, e.g. net-pf-10-proto-132
152                          * (net-pf-PF_INET6-proto-IPPROTO_SCTP)
153                          */
154                         else
155                                 request_module("net-pf-%d-proto-%d",
156                                                 PF_INET6, protocol);
157                         goto lookup_protocol;
158                 } else
159                         goto out_rcu_unlock;
160         }
161 
162         err = -EPERM;
163         if (sock->type == SOCK_RAW && !kern && !capable(CAP_NET_RAW))
164                 goto out_rcu_unlock;
165 
166         sock->ops = answer->ops;
167         answer_prot = answer->prot;
168         answer_no_check = answer->no_check;
169         answer_flags = answer->flags;
170         rcu_read_unlock();
171 
172         WARN_ON(answer_prot->slab == NULL);
173 
174         err = -ENOBUFS;
175         sk = sk_alloc(net, PF_INET6, GFP_KERNEL, answer_prot);
176         if (sk == NULL)
177                 goto out;
178 
179         sock_init_data(sock, sk);
180 
181         err = 0;
182         sk->sk_no_check = answer_no_check;
183         if (INET_PROTOSW_REUSE & answer_flags)
184                 sk->sk_reuse = 1;
185 
186         inet = inet_sk(sk);
187         inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0;
188 
189         if (SOCK_RAW == sock->type) {
190                 inet->inet_num = protocol;
191                 if (IPPROTO_RAW == protocol)
192                         inet->hdrincl = 1;
193         }
194 
195         sk->sk_destruct         = inet_sock_destruct;
196         sk->sk_family           = PF_INET6;
197         sk->sk_protocol         = protocol;
198 
199         sk->sk_backlog_rcv      = answer->prot->backlog_rcv;
200 
201         inet_sk(sk)->pinet6 = np = inet6_sk_generic(sk);
202         np->hop_limit   = -1;
203         np->mcast_hops  = IPV6_DEFAULT_MCASTHOPS;
204         np->mc_loop     = 1;
205         np->pmtudisc    = IPV6_PMTUDISC_WANT;
206         np->ipv6only    = net->ipv6.sysctl.bindv6only;
207 
208         /* Init the ipv4 part of the socket since we can have sockets
209          * using v6 API for ipv4.
210          */
211         inet->uc_ttl    = -1;
212 
213         inet->mc_loop   = 1;
214         inet->mc_ttl    = 1;
215         inet->mc_index  = 0;
216         inet->mc_list   = NULL;
217 
218         if (ipv4_config.no_pmtu_disc)
219                 inet->pmtudisc = IP_PMTUDISC_DONT;
220         else
221                 inet->pmtudisc = IP_PMTUDISC_WANT;
222         /*
223          * Increment only the relevant sk_prot->socks debug field, this changes
224          * the previous behaviour of incrementing both the equivalent to
225          * answer->prot->socks (inet6_sock_nr) and inet_sock_nr.
226          *
227          * This allows better debug granularity as we'll know exactly how many
228          * UDPv6, TCPv6, etc socks were allocated, not the sum of all IPv6
229          * transport protocol socks. -acme
230          */
231         sk_refcnt_debug_inc(sk);
232 
233         if (inet->inet_num) {
234                 /* It assumes that any protocol which allows
235                  * the user to assign a number at socket
236                  * creation time automatically shares.
237                  */
238                 inet->inet_sport = htons(inet->inet_num);
239                 sk->sk_prot->hash(sk);
240         }
241         if (sk->sk_prot->init) {
242                 err = sk->sk_prot->init(sk);
243                 if (err) {
244                         sk_common_release(sk);
245                         goto out;
246                 }
247         }
248 out:
249         return err;
250 out_rcu_unlock:
251         rcu_read_unlock();
252         goto out;
253 }
254 
255 
256 /* bind for INET6 API */
257 int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
258 {
259         struct sockaddr_in6 *addr=(struct sockaddr_in6 *)uaddr;
260         struct sock *sk = sock->sk;
261         struct inet_sock *inet = inet_sk(sk);
262         struct ipv6_pinfo *np = inet6_sk(sk);
263         struct net *net = sock_net(sk);
264         __be32 v4addr = 0;
265         unsigned short snum;
266         int addr_type = 0;
267         int err = 0;
268 
269         /* If the socket has its own bind function then use it. */
270         if (sk->sk_prot->bind)
271                 return sk->sk_prot->bind(sk, uaddr, addr_len);
272 
273         if (addr_len < SIN6_LEN_RFC2133)
274                 return -EINVAL;
275 
276         if (addr->sin6_family != AF_INET6)
277                 return -EAFNOSUPPORT;
278 
279         addr_type = ipv6_addr_type(&addr->sin6_addr);
280         if ((addr_type & IPV6_ADDR_MULTICAST) && sock->type == SOCK_STREAM)
281                 return -EINVAL;
282 
283         snum = ntohs(addr->sin6_port);
284         if (snum && snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE))
285                 return -EACCES;
286 
287         lock_sock(sk);
288 
289         /* Check these errors (active socket, double bind). */
290         if (sk->sk_state != TCP_CLOSE || inet->inet_num) {
291                 err = -EINVAL;
292                 goto out;
293         }
294 
295         /* Check if the address belongs to the host. */
296         if (addr_type == IPV6_ADDR_MAPPED) {
297                 int chk_addr_ret;
298 
299                 /* Binding to v4-mapped address on a v6-only socket
300                  * makes no sense
301                  */
302                 if (np->ipv6only) {
303                         err = -EINVAL;
304                         goto out;
305                 }
306 
307                 /* Reproduce AF_INET checks to make the bindings consistent */
308                 v4addr = addr->sin6_addr.s6_addr32[3];
309                 chk_addr_ret = inet_addr_type(net, v4addr);
310                 if (!sysctl_ip_nonlocal_bind &&
311                     !(inet->freebind || inet->transparent) &&
312                     v4addr != htonl(INADDR_ANY) &&
313                     chk_addr_ret != RTN_LOCAL &&
314                     chk_addr_ret != RTN_MULTICAST &&
315                     chk_addr_ret != RTN_BROADCAST) {
316                         err = -EADDRNOTAVAIL;
317                         goto out;
318                 }
319         } else {
320                 if (addr_type != IPV6_ADDR_ANY) {
321                         struct net_device *dev = NULL;
322 
323                         rcu_read_lock();
324                         if (addr_type & IPV6_ADDR_LINKLOCAL) {
325                                 if (addr_len >= sizeof(struct sockaddr_in6) &&
326                                     addr->sin6_scope_id) {
327                                         /* Override any existing binding, if another one
328                                          * is supplied by user.
329                                          */
330                                         sk->sk_bound_dev_if = addr->sin6_scope_id;
331                                 }
332 
333                                 /* Binding to link-local address requires an interface */
334                                 if (!sk->sk_bound_dev_if) {
335                                         err = -EINVAL;
336                                         goto out_unlock;
337                                 }
338                                 dev = dev_get_by_index_rcu(net, sk->sk_bound_dev_if);
339                                 if (!dev) {
340                                         err = -ENODEV;
341                                         goto out_unlock;
342                                 }
343                         }
344 
345                         /* ipv4 addr of the socket is invalid.  Only the
346                          * unspecified and mapped address have a v4 equivalent.
347                          */
348                         v4addr = LOOPBACK4_IPV6;
349                         if (!(addr_type & IPV6_ADDR_MULTICAST)) {
350                                 if (!inet->transparent &&
351                                     !ipv6_chk_addr(net, &addr->sin6_addr,
352                                                    dev, 0)) {
353                                         err = -EADDRNOTAVAIL;
354                                         goto out_unlock;
355                                 }
356                         }
357                         rcu_read_unlock();
358                 }
359         }
360 
361         inet->inet_rcv_saddr = v4addr;
362         inet->inet_saddr = v4addr;
363 
364         ipv6_addr_copy(&np->rcv_saddr, &addr->sin6_addr);
365 
366         if (!(addr_type & IPV6_ADDR_MULTICAST))
367                 ipv6_addr_copy(&np->saddr, &addr->sin6_addr);
368 
369         /* Make sure we are allowed to bind here. */
370         if (sk->sk_prot->get_port(sk, snum)) {
371                 inet_reset_saddr(sk);
372                 err = -EADDRINUSE;
373                 goto out;
374         }
375 
376         if (addr_type != IPV6_ADDR_ANY) {
377                 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
378                 if (addr_type != IPV6_ADDR_MAPPED)
379                         np->ipv6only = 1;
380         }
381         if (snum)
382                 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
383         inet->inet_sport = htons(inet->inet_num);
384         inet->inet_dport = 0;
385         inet->inet_daddr = 0;
386 out:
387         release_sock(sk);
388         return err;
389 out_unlock:
390         rcu_read_unlock();
391         goto out;
392 }
393 
394 EXPORT_SYMBOL(inet6_bind);
395 
396 int inet6_release(struct socket *sock)
397 {
398         struct sock *sk = sock->sk;
399 
400         if (sk == NULL)
401                 return -EINVAL;
402 
403         /* Free mc lists */
404         ipv6_sock_mc_close(sk);
405 
406         /* Free ac lists */
407         ipv6_sock_ac_close(sk);
408 
409         return inet_release(sock);
410 }
411 
412 EXPORT_SYMBOL(inet6_release);
413 
414 void inet6_destroy_sock(struct sock *sk)
415 {
416         struct ipv6_pinfo *np = inet6_sk(sk);
417         struct sk_buff *skb;
418         struct ipv6_txoptions *opt;
419 
420         /* Release rx options */
421 
422         if ((skb = xchg(&np->pktoptions, NULL)) != NULL)
423                 kfree_skb(skb);
424 
425         if ((skb = xchg(&np->rxpmtu, NULL)) != NULL)
426                 kfree_skb(skb);
427 
428         /* Free flowlabels */
429         fl6_free_socklist(sk);
430 
431         /* Free tx options */
432 
433         if ((opt = xchg(&np->opt, NULL)) != NULL)
434                 sock_kfree_s(sk, opt, opt->tot_len);
435 }
436 
437 EXPORT_SYMBOL_GPL(inet6_destroy_sock);
438 
439 /*
440  *      This does both peername and sockname.
441  */
442 
443 int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
444                  int *uaddr_len, int peer)
445 {
446         struct sockaddr_in6 *sin=(struct sockaddr_in6 *)uaddr;
447         struct sock *sk = sock->sk;
448         struct inet_sock *inet = inet_sk(sk);
449         struct ipv6_pinfo *np = inet6_sk(sk);
450 
451         sin->sin6_family = AF_INET6;
452         sin->sin6_flowinfo = 0;
453         sin->sin6_scope_id = 0;
454         if (peer) {
455                 if (!inet->inet_dport)
456                         return -ENOTCONN;
457                 if (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
458                     peer == 1)
459                         return -ENOTCONN;
460                 sin->sin6_port = inet->inet_dport;
461                 ipv6_addr_copy(&sin->sin6_addr, &np->daddr);
462                 if (np->sndflow)
463                         sin->sin6_flowinfo = np->flow_label;
464         } else {
465                 if (ipv6_addr_any(&np->rcv_saddr))
466                         ipv6_addr_copy(&sin->sin6_addr, &np->saddr);
467                 else
468                         ipv6_addr_copy(&sin->sin6_addr, &np->rcv_saddr);
469 
470                 sin->sin6_port = inet->inet_sport;
471         }
472         if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL)
473                 sin->sin6_scope_id = sk->sk_bound_dev_if;
474         *uaddr_len = sizeof(*sin);
475         return 0;
476 }
477 
478 EXPORT_SYMBOL(inet6_getname);
479 
480 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
481 {
482         struct sock *sk = sock->sk;
483         struct net *net = sock_net(sk);
484 
485         switch(cmd)
486         {
487         case SIOCGSTAMP:
488                 return sock_get_timestamp(sk, (struct timeval __user *)arg);
489 
490         case SIOCGSTAMPNS:
491                 return sock_get_timestampns(sk, (struct timespec __user *)arg);
492 
493         case SIOCADDRT:
494         case SIOCDELRT:
495 
496                 return ipv6_route_ioctl(net, cmd, (void __user *)arg);
497 
498         case SIOCSIFADDR:
499                 return addrconf_add_ifaddr(net, (void __user *) arg);
500         case SIOCDIFADDR:
501                 return addrconf_del_ifaddr(net, (void __user *) arg);
502         case SIOCSIFDSTADDR:
503                 return addrconf_set_dstaddr(net, (void __user *) arg);
504         default:
505                 if (!sk->sk_prot->ioctl)
506                         return -ENOIOCTLCMD;
507                 return sk->sk_prot->ioctl(sk, cmd, arg);
508         }
509         /*NOTREACHED*/
510         return 0;
511 }
512 
513 EXPORT_SYMBOL(inet6_ioctl);
514 
515 const struct proto_ops inet6_stream_ops = {
516         .family            = PF_INET6,
517         .owner             = THIS_MODULE,
518         .release           = inet6_release,
519         .bind              = inet6_bind,
520         .connect           = inet_stream_connect,       /* ok           */
521         .socketpair        = sock_no_socketpair,        /* a do nothing */
522         .accept            = inet_accept,               /* ok           */
523         .getname           = inet6_getname,
524         .poll              = tcp_poll,                  /* ok           */
525         .ioctl             = inet6_ioctl,               /* must change  */
526         .listen            = inet_listen,               /* ok           */
527         .shutdown          = inet_shutdown,             /* ok           */
528         .setsockopt        = sock_common_setsockopt,    /* ok           */
529         .getsockopt        = sock_common_getsockopt,    /* ok           */
530         .sendmsg           = inet_sendmsg,              /* ok           */
531         .recvmsg           = inet_recvmsg,              /* ok           */
532         .mmap              = sock_no_mmap,
533         .sendpage          = inet_sendpage,
534         .splice_read       = tcp_splice_read,
535 #ifdef CONFIG_COMPAT
536         .compat_setsockopt = compat_sock_common_setsockopt,
537         .compat_getsockopt = compat_sock_common_getsockopt,
538 #endif
539 };
540 
541 const struct proto_ops inet6_dgram_ops = {
542         .family            = PF_INET6,
543         .owner             = THIS_MODULE,
544         .release           = inet6_release,
545         .bind              = inet6_bind,
546         .connect           = inet_dgram_connect,        /* ok           */
547         .socketpair        = sock_no_socketpair,        /* a do nothing */
548         .accept            = sock_no_accept,            /* a do nothing */
549         .getname           = inet6_getname,
550         .poll              = udp_poll,                  /* ok           */
551         .ioctl             = inet6_ioctl,               /* must change  */
552         .listen            = sock_no_listen,            /* ok           */
553         .shutdown          = inet_shutdown,             /* ok           */
554         .setsockopt        = sock_common_setsockopt,    /* ok           */
555         .getsockopt        = sock_common_getsockopt,    /* ok           */
556         .sendmsg           = inet_sendmsg,              /* ok           */
557         .recvmsg           = inet_recvmsg,              /* ok           */
558         .mmap              = sock_no_mmap,
559         .sendpage          = sock_no_sendpage,
560 #ifdef CONFIG_COMPAT
561         .compat_setsockopt = compat_sock_common_setsockopt,
562         .compat_getsockopt = compat_sock_common_getsockopt,
563 #endif
564 };
565 
566 static const struct net_proto_family inet6_family_ops = {
567         .family = PF_INET6,
568         .create = inet6_create,
569         .owner  = THIS_MODULE,
570 };
571 
572 int inet6_register_protosw(struct inet_protosw *p)
573 {
574         struct list_head *lh;
575         struct inet_protosw *answer;
576         struct list_head *last_perm;
577         int protocol = p->protocol;
578         int ret;
579 
580         spin_lock_bh(&inetsw6_lock);
581 
582         ret = -EINVAL;
583         if (p->type >= SOCK_MAX)
584                 goto out_illegal;
585 
586         /* If we are trying to override a permanent protocol, bail. */
587         answer = NULL;
588         ret = -EPERM;
589         last_perm = &inetsw6[p->type];
590         list_for_each(lh, &inetsw6[p->type]) {
591                 answer = list_entry(lh, struct inet_protosw, list);
592 
593                 /* Check only the non-wild match. */
594                 if (INET_PROTOSW_PERMANENT & answer->flags) {
595                         if (protocol == answer->protocol)
596                                 break;
597                         last_perm = lh;
598                 }
599 
600                 answer = NULL;
601         }
602         if (answer)
603                 goto out_permanent;
604 
605         /* Add the new entry after the last permanent entry if any, so that
606          * the new entry does not override a permanent entry when matched with
607          * a wild-card protocol. But it is allowed to override any existing
608          * non-permanent entry.  This means that when we remove this entry, the
609          * system automatically returns to the old behavior.
610          */
611         list_add_rcu(&p->list, last_perm);
612         ret = 0;
613 out:
614         spin_unlock_bh(&inetsw6_lock);
615         return ret;
616 
617 out_permanent:
618         printk(KERN_ERR "Attempt to override permanent protocol %d.\n",
619                protocol);
620         goto out;
621 
622 out_illegal:
623         printk(KERN_ERR
624                "Ignoring attempt to register invalid socket type %d.\n",
625                p->type);
626         goto out;
627 }
628 
629 EXPORT_SYMBOL(inet6_register_protosw);
630 
631 void
632 inet6_unregister_protosw(struct inet_protosw *p)
633 {
634         if (INET_PROTOSW_PERMANENT & p->flags) {
635                 printk(KERN_ERR
636                        "Attempt to unregister permanent protocol %d.\n",
637                        p->protocol);
638         } else {
639                 spin_lock_bh(&inetsw6_lock);
640                 list_del_rcu(&p->list);
641                 spin_unlock_bh(&inetsw6_lock);
642 
643                 synchronize_net();
644         }
645 }
646 
647 EXPORT_SYMBOL(inet6_unregister_protosw);
648 
649 int inet6_sk_rebuild_header(struct sock *sk)
650 {
651         struct ipv6_pinfo *np = inet6_sk(sk);
652         struct dst_entry *dst;
653 
654         dst = __sk_dst_check(sk, np->dst_cookie);
655 
656         if (dst == NULL) {
657                 struct inet_sock *inet = inet_sk(sk);
658                 struct in6_addr *final_p, final;
659                 struct flowi6 fl6;
660 
661                 memset(&fl6, 0, sizeof(fl6));
662                 fl6.flowi6_proto = sk->sk_protocol;
663                 ipv6_addr_copy(&fl6.daddr, &np->daddr);
664                 ipv6_addr_copy(&fl6.saddr, &np->saddr);
665                 fl6.flowlabel = np->flow_label;
666                 fl6.flowi6_oif = sk->sk_bound_dev_if;
667                 fl6.flowi6_mark = sk->sk_mark;
668                 fl6.fl6_dport = inet->inet_dport;
669                 fl6.fl6_sport = inet->inet_sport;
670                 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
671 
672                 final_p = fl6_update_dst(&fl6, np->opt, &final);
673 
674                 dst = ip6_dst_lookup_flow(sk, &fl6, final_p, false);
675                 if (IS_ERR(dst)) {
676                         sk->sk_route_caps = 0;
677                         sk->sk_err_soft = -PTR_ERR(dst);
678                         return PTR_ERR(dst);
679                 }
680 
681                 __ip6_dst_store(sk, dst, NULL, NULL);
682         }
683 
684         return 0;
685 }
686 
687 EXPORT_SYMBOL_GPL(inet6_sk_rebuild_header);
688 
689 int ipv6_opt_accepted(struct sock *sk, struct sk_buff *skb)
690 {
691         struct ipv6_pinfo *np = inet6_sk(sk);
692         struct inet6_skb_parm *opt = IP6CB(skb);
693 
694         if (np->rxopt.all) {
695                 if ((opt->hop && (np->rxopt.bits.hopopts ||
696                                   np->rxopt.bits.ohopopts)) ||
697                     ((IPV6_FLOWINFO_MASK &
698                       *(__be32 *)skb_network_header(skb)) &&
699                      np->rxopt.bits.rxflow) ||
700                     (opt->srcrt && (np->rxopt.bits.srcrt ||
701                      np->rxopt.bits.osrcrt)) ||
702                     ((opt->dst1 || opt->dst0) &&
703                      (np->rxopt.bits.dstopts || np->rxopt.bits.odstopts)))
704                         return 1;
705         }
706         return 0;
707 }
708 
709 EXPORT_SYMBOL_GPL(ipv6_opt_accepted);
710 
711 static int ipv6_gso_pull_exthdrs(struct sk_buff *skb, int proto)
712 {
713         const struct inet6_protocol *ops = NULL;
714 
715         for (;;) {
716                 struct ipv6_opt_hdr *opth;
717                 int len;
718 
719                 if (proto != NEXTHDR_HOP) {
720                         ops = rcu_dereference(inet6_protos[proto]);
721 
722                         if (unlikely(!ops))
723                                 break;
724 
725                         if (!(ops->flags & INET6_PROTO_GSO_EXTHDR))
726                                 break;
727                 }
728 
729                 if (unlikely(!pskb_may_pull(skb, 8)))
730                         break;
731 
732                 opth = (void *)skb->data;
733                 len = ipv6_optlen(opth);
734 
735                 if (unlikely(!pskb_may_pull(skb, len)))
736                         break;
737 
738                 proto = opth->nexthdr;
739                 __skb_pull(skb, len);
740         }
741 
742         return proto;
743 }
744 
745 static int ipv6_gso_send_check(struct sk_buff *skb)
746 {
747         const struct ipv6hdr *ipv6h;
748         const struct inet6_protocol *ops;
749         int err = -EINVAL;
750 
751         if (unlikely(!pskb_may_pull(skb, sizeof(*ipv6h))))
752                 goto out;
753 
754         ipv6h = ipv6_hdr(skb);
755         __skb_pull(skb, sizeof(*ipv6h));
756         err = -EPROTONOSUPPORT;
757 
758         rcu_read_lock();
759         ops = rcu_dereference(inet6_protos[
760                 ipv6_gso_pull_exthdrs(skb, ipv6h->nexthdr)]);
761 
762         if (likely(ops && ops->gso_send_check)) {
763                 skb_reset_transport_header(skb);
764                 err = ops->gso_send_check(skb);
765         }
766         rcu_read_unlock();
767 
768 out:
769         return err;
770 }
771 
772 static struct sk_buff *ipv6_gso_segment(struct sk_buff *skb, u32 features)
773 {
774         struct sk_buff *segs = ERR_PTR(-EINVAL);
775         struct ipv6hdr *ipv6h;
776         const struct inet6_protocol *ops;
777         int proto;
778         struct frag_hdr *fptr;
779         unsigned int unfrag_ip6hlen;
780         u8 *prevhdr;
781         int offset = 0;
782 
783         if (!(features & NETIF_F_V6_CSUM))
784                 features &= ~NETIF_F_SG;
785 
786         if (unlikely(skb_shinfo(skb)->gso_type &
787                      ~(SKB_GSO_UDP |
788                        SKB_GSO_DODGY |
789                        SKB_GSO_TCP_ECN |
790                        SKB_GSO_TCPV6 |
791                        0)))
792                 goto out;
793 
794         if (unlikely(!pskb_may_pull(skb, sizeof(*ipv6h))))
795                 goto out;
796 
797         ipv6h = ipv6_hdr(skb);
798         __skb_pull(skb, sizeof(*ipv6h));
799         segs = ERR_PTR(-EPROTONOSUPPORT);
800 
801         proto = ipv6_gso_pull_exthdrs(skb, ipv6h->nexthdr);
802         rcu_read_lock();
803         ops = rcu_dereference(inet6_protos[proto]);
804         if (likely(ops && ops->gso_segment)) {
805                 skb_reset_transport_header(skb);
806                 segs = ops->gso_segment(skb, features);
807         }
808         rcu_read_unlock();
809 
810         if (IS_ERR(segs))
811                 goto out;
812 
813         for (skb = segs; skb; skb = skb->next) {
814                 ipv6h = ipv6_hdr(skb);
815                 ipv6h->payload_len = htons(skb->len - skb->mac_len -
816                                            sizeof(*ipv6h));
817                 if (proto == IPPROTO_UDP) {
818                         unfrag_ip6hlen = ip6_find_1stfragopt(skb, &prevhdr);
819                         fptr = (struct frag_hdr *)(skb_network_header(skb) +
820                                 unfrag_ip6hlen);
821                         fptr->frag_off = htons(offset);
822                         if (skb->next != NULL)
823                                 fptr->frag_off |= htons(IP6_MF);
824                         offset += (ntohs(ipv6h->payload_len) -
825                                    sizeof(struct frag_hdr));
826                 }
827         }
828 
829 out:
830         return segs;
831 }
832 
833 struct ipv6_gro_cb {
834         struct napi_gro_cb napi;
835         int proto;
836 };
837 
838 #define IPV6_GRO_CB(skb) ((struct ipv6_gro_cb *)(skb)->cb)
839 
840 static struct sk_buff **ipv6_gro_receive(struct sk_buff **head,
841                                          struct sk_buff *skb)
842 {
843         const struct inet6_protocol *ops;
844         struct sk_buff **pp = NULL;
845         struct sk_buff *p;
846         struct ipv6hdr *iph;
847         unsigned int nlen;
848         unsigned int hlen;
849         unsigned int off;
850         int flush = 1;
851         int proto;
852         __wsum csum;
853 
854         off = skb_gro_offset(skb);
855         hlen = off + sizeof(*iph);
856         iph = skb_gro_header_fast(skb, off);
857         if (skb_gro_header_hard(skb, hlen)) {
858                 iph = skb_gro_header_slow(skb, hlen, off);
859                 if (unlikely(!iph))
860                         goto out;
861         }
862 
863         skb_gro_pull(skb, sizeof(*iph));
864         skb_set_transport_header(skb, skb_gro_offset(skb));
865 
866         flush += ntohs(iph->payload_len) != skb_gro_len(skb);
867 
868         rcu_read_lock();
869         proto = iph->nexthdr;
870         ops = rcu_dereference(inet6_protos[proto]);
871         if (!ops || !ops->gro_receive) {
872                 __pskb_pull(skb, skb_gro_offset(skb));
873                 proto = ipv6_gso_pull_exthdrs(skb, proto);
874                 skb_gro_pull(skb, -skb_transport_offset(skb));
875                 skb_reset_transport_header(skb);
876                 __skb_push(skb, skb_gro_offset(skb));
877 
878                 ops = rcu_dereference(inet6_protos[proto]);
879                 if (!ops || !ops->gro_receive)
880                         goto out_unlock;
881 
882                 iph = ipv6_hdr(skb);
883         }
884 
885         IPV6_GRO_CB(skb)->proto = proto;
886 
887         flush--;
888         nlen = skb_network_header_len(skb);
889 
890         for (p = *head; p; p = p->next) {
891                 struct ipv6hdr *iph2;
892 
893                 if (!NAPI_GRO_CB(p)->same_flow)
894                         continue;
895 
896                 iph2 = ipv6_hdr(p);
897 
898                 /* All fields must match except length. */
899                 if (nlen != skb_network_header_len(p) ||
900                     memcmp(iph, iph2, offsetof(struct ipv6hdr, payload_len)) ||
901                     memcmp(&iph->nexthdr, &iph2->nexthdr,
902                            nlen - offsetof(struct ipv6hdr, nexthdr))) {
903                         NAPI_GRO_CB(p)->same_flow = 0;
904                         continue;
905                 }
906 
907                 NAPI_GRO_CB(p)->flush |= flush;
908         }
909 
910         NAPI_GRO_CB(skb)->flush |= flush;
911 
912         csum = skb->csum;
913         skb_postpull_rcsum(skb, iph, skb_network_header_len(skb));
914 
915         pp = ops->gro_receive(head, skb);
916 
917         skb->csum = csum;
918 
919 out_unlock:
920         rcu_read_unlock();
921 
922 out:
923         NAPI_GRO_CB(skb)->flush |= flush;
924 
925         return pp;
926 }
927 
928 static int ipv6_gro_complete(struct sk_buff *skb)
929 {
930         const struct inet6_protocol *ops;
931         struct ipv6hdr *iph = ipv6_hdr(skb);
932         int err = -ENOSYS;
933 
934         iph->payload_len = htons(skb->len - skb_network_offset(skb) -
935                                  sizeof(*iph));
936 
937         rcu_read_lock();
938         ops = rcu_dereference(inet6_protos[IPV6_GRO_CB(skb)->proto]);
939         if (WARN_ON(!ops || !ops->gro_complete))
940                 goto out_unlock;
941 
942         err = ops->gro_complete(skb);
943 
944 out_unlock:
945         rcu_read_unlock();
946 
947         return err;
948 }
949 
950 static struct packet_type ipv6_packet_type __read_mostly = {
951         .type = cpu_to_be16(ETH_P_IPV6),
952         .func = ipv6_rcv,
953         .gso_send_check = ipv6_gso_send_check,
954         .gso_segment = ipv6_gso_segment,
955         .gro_receive = ipv6_gro_receive,
956         .gro_complete = ipv6_gro_complete,
957 };
958 
959 static int __init ipv6_packet_init(void)
960 {
961         dev_add_pack(&ipv6_packet_type);
962         return 0;
963 }
964 
965 static void ipv6_packet_cleanup(void)
966 {
967         dev_remove_pack(&ipv6_packet_type);
968 }
969 
970 static int __net_init ipv6_init_mibs(struct net *net)
971 {
972         if (snmp_mib_init((void __percpu **)net->mib.udp_stats_in6,
973                           sizeof(struct udp_mib),
974                           __alignof__(struct udp_mib)) < 0)
975                 return -ENOMEM;
976         if (snmp_mib_init((void __percpu **)net->mib.udplite_stats_in6,
977                           sizeof(struct udp_mib),
978                           __alignof__(struct udp_mib)) < 0)
979                 goto err_udplite_mib;
980         if (snmp_mib_init((void __percpu **)net->mib.ipv6_statistics,
981                           sizeof(struct ipstats_mib),
982                           __alignof__(struct ipstats_mib)) < 0)
983                 goto err_ip_mib;
984         if (snmp_mib_init((void __percpu **)net->mib.icmpv6_statistics,
985                           sizeof(struct icmpv6_mib),
986                           __alignof__(struct icmpv6_mib)) < 0)
987                 goto err_icmp_mib;
988         if (snmp_mib_init((void __percpu **)net->mib.icmpv6msg_statistics,
989                           sizeof(struct icmpv6msg_mib),
990                           __alignof__(struct icmpv6msg_mib)) < 0)
991                 goto err_icmpmsg_mib;
992         return 0;
993 
994 err_icmpmsg_mib:
995         snmp_mib_free((void __percpu **)net->mib.icmpv6_statistics);
996 err_icmp_mib:
997         snmp_mib_free((void __percpu **)net->mib.ipv6_statistics);
998 err_ip_mib:
999         snmp_mib_free((void __percpu **)net->mib.udplite_stats_in6);
1000 err_udplite_mib:
1001         snmp_mib_free((void __percpu **)net->mib.udp_stats_in6);
1002         return -ENOMEM;
1003 }
1004 
1005 static void ipv6_cleanup_mibs(struct net *net)
1006 {
1007         snmp_mib_free((void __percpu **)net->mib.udp_stats_in6);
1008         snmp_mib_free((void __percpu **)net->mib.udplite_stats_in6);
1009         snmp_mib_free((void __percpu **)net->mib.ipv6_statistics);
1010         snmp_mib_free((void __percpu **)net->mib.icmpv6_statistics);
1011         snmp_mib_free((void __percpu **)net->mib.icmpv6msg_statistics);
1012 }
1013 
1014 static int __net_init inet6_net_init(struct net *net)
1015 {
1016         int err = 0;
1017 
1018         net->ipv6.sysctl.bindv6only = 0;
1019         net->ipv6.sysctl.icmpv6_time = 1*HZ;
1020 
1021         err = ipv6_init_mibs(net);
1022         if (err)
1023                 return err;
1024 #ifdef CONFIG_PROC_FS
1025         err = udp6_proc_init(net);
1026         if (err)
1027                 goto out;
1028         err = tcp6_proc_init(net);
1029         if (err)
1030                 goto proc_tcp6_fail;
1031         err = ac6_proc_init(net);
1032         if (err)
1033                 goto proc_ac6_fail;
1034 #endif
1035         return err;
1036 
1037 #ifdef CONFIG_PROC_FS
1038 proc_ac6_fail:
1039         tcp6_proc_exit(net);
1040 proc_tcp6_fail:
1041         udp6_proc_exit(net);
1042 out:
1043         ipv6_cleanup_mibs(net);
1044         return err;
1045 #endif
1046 }
1047 
1048 static void __net_exit inet6_net_exit(struct net *net)
1049 {
1050 #ifdef CONFIG_PROC_FS
1051         udp6_proc_exit(net);
1052         tcp6_proc_exit(net);
1053         ac6_proc_exit(net);
1054 #endif
1055         ipv6_cleanup_mibs(net);
1056 }
1057 
1058 static struct pernet_operations inet6_net_ops = {
1059         .init = inet6_net_init,
1060         .exit = inet6_net_exit,
1061 };
1062 
1063 static int __init inet6_init(void)
1064 {
1065         struct sk_buff *dummy_skb;
1066         struct list_head *r;
1067         int err = 0;
1068 
1069         BUILD_BUG_ON(sizeof(struct inet6_skb_parm) > sizeof(dummy_skb->cb));
1070 
1071         /* Register the socket-side information for inet6_create.  */
1072         for(r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r)
1073                 INIT_LIST_HEAD(r);
1074 
1075         if (disable_ipv6_mod) {
1076                 printk(KERN_INFO
1077                        "IPv6: Loaded, but administratively disabled, "
1078                        "reboot required to enable\n");
1079                 goto out;
1080         }
1081 
1082         err = proto_register(&tcpv6_prot, 1);
1083         if (err)
1084                 goto out;
1085 
1086         err = proto_register(&udpv6_prot, 1);
1087         if (err)
1088                 goto out_unregister_tcp_proto;
1089 
1090         err = proto_register(&udplitev6_prot, 1);
1091         if (err)
1092                 goto out_unregister_udp_proto;
1093 
1094         err = proto_register(&rawv6_prot, 1);
1095         if (err)
1096                 goto out_unregister_udplite_proto;
1097 
1098 
1099         /* We MUST register RAW sockets before we create the ICMP6,
1100          * IGMP6, or NDISC control sockets.
1101          */
1102         err = rawv6_init();
1103         if (err)
1104                 goto out_unregister_raw_proto;
1105 
1106         /* Register the family here so that the init calls below will
1107          * be able to create sockets. (?? is this dangerous ??)
1108          */
1109         err = sock_register(&inet6_family_ops);
1110         if (err)
1111                 goto out_sock_register_fail;
1112 
1113 #ifdef CONFIG_SYSCTL
1114         err = ipv6_static_sysctl_register();
1115         if (err)
1116                 goto static_sysctl_fail;
1117 #endif
1118         /*
1119          *      ipngwg API draft makes clear that the correct semantics
1120          *      for TCP and UDP is to consider one TCP and UDP instance
1121          *      in a host available by both INET and INET6 APIs and
1122          *      able to communicate via both network protocols.
1123          */
1124 
1125         err = register_pernet_subsys(&inet6_net_ops);
1126         if (err)
1127                 goto register_pernet_fail;
1128         err = icmpv6_init();
1129         if (err)
1130                 goto icmp_fail;
1131         err = ip6_mr_init();
1132         if (err)
1133                 goto ipmr_fail;
1134         err = ndisc_init();
1135         if (err)
1136                 goto ndisc_fail;
1137         err = igmp6_init();
1138         if (err)
1139                 goto igmp_fail;
1140         err = ipv6_netfilter_init();
1141         if (err)
1142                 goto netfilter_fail;
1143         /* Create /proc/foo6 entries. */
1144 #ifdef CONFIG_PROC_FS
1145         err = -ENOMEM;
1146         if (raw6_proc_init())
1147                 goto proc_raw6_fail;
1148         if (udplite6_proc_init())
1149                 goto proc_udplite6_fail;
1150         if (ipv6_misc_proc_init())
1151                 goto proc_misc6_fail;
1152         if (if6_proc_init())
1153                 goto proc_if6_fail;
1154 #endif
1155         err = ip6_route_init();
1156         if (err)
1157                 goto ip6_route_fail;
1158         err = ip6_flowlabel_init();
1159         if (err)
1160                 goto ip6_flowlabel_fail;
1161         err = addrconf_init();
1162         if (err)
1163                 goto addrconf_fail;
1164 
1165         /* Init v6 extension headers. */
1166         err = ipv6_exthdrs_init();
1167         if (err)
1168                 goto ipv6_exthdrs_fail;
1169 
1170         err = ipv6_frag_init();
1171         if (err)
1172                 goto ipv6_frag_fail;
1173 
1174         /* Init v6 transport protocols. */
1175         err = udpv6_init();
1176         if (err)
1177                 goto udpv6_fail;
1178 
1179         err = udplitev6_init();
1180         if (err)
1181                 goto udplitev6_fail;
1182 
1183         err = tcpv6_init();
1184         if (err)
1185                 goto tcpv6_fail;
1186 
1187         err = ipv6_packet_init();
1188         if (err)
1189                 goto ipv6_packet_fail;
1190 
1191 #ifdef CONFIG_SYSCTL
1192         err = ipv6_sysctl_register();
1193         if (err)
1194                 goto sysctl_fail;
1195 #endif
1196 out:
1197         return err;
1198 
1199 #ifdef CONFIG_SYSCTL
1200 sysctl_fail:
1201         ipv6_packet_cleanup();
1202 #endif
1203 ipv6_packet_fail:
1204         tcpv6_exit();
1205 tcpv6_fail:
1206         udplitev6_exit();
1207 udplitev6_fail:
1208         udpv6_exit();
1209 udpv6_fail:
1210         ipv6_frag_exit();
1211 ipv6_frag_fail:
1212         ipv6_exthdrs_exit();
1213 ipv6_exthdrs_fail:
1214         addrconf_cleanup();
1215 addrconf_fail:
1216         ip6_flowlabel_cleanup();
1217 ip6_flowlabel_fail:
1218         ip6_route_cleanup();
1219 ip6_route_fail:
1220 #ifdef CONFIG_PROC_FS
1221         if6_proc_exit();
1222 proc_if6_fail:
1223         ipv6_misc_proc_exit();
1224 proc_misc6_fail:
1225         udplite6_proc_exit();
1226 proc_udplite6_fail:
1227         raw6_proc_exit();
1228 proc_raw6_fail:
1229 #endif
1230         ipv6_netfilter_fini();
1231 netfilter_fail:
1232         igmp6_cleanup();
1233 igmp_fail:
1234         ndisc_cleanup();
1235 ndisc_fail:
1236         ip6_mr_cleanup();
1237 ipmr_fail:
1238         icmpv6_cleanup();
1239 icmp_fail:
1240         unregister_pernet_subsys(&inet6_net_ops);
1241 register_pernet_fail:
1242 #ifdef CONFIG_SYSCTL
1243         ipv6_static_sysctl_unregister();
1244 static_sysctl_fail:
1245 #endif
1246         sock_unregister(PF_INET6);
1247         rtnl_unregister_all(PF_INET6);
1248 out_sock_register_fail:
1249         rawv6_exit();
1250 out_unregister_raw_proto:
1251         proto_unregister(&rawv6_prot);
1252 out_unregister_udplite_proto:
1253         proto_unregister(&udplitev6_prot);
1254 out_unregister_udp_proto:
1255         proto_unregister(&udpv6_prot);
1256 out_unregister_tcp_proto:
1257         proto_unregister(&tcpv6_prot);
1258         goto out;
1259 }
1260 module_init(inet6_init);
1261 
1262 static void __exit inet6_exit(void)
1263 {
1264         if (disable_ipv6_mod)
1265                 return;
1266 
1267         /* First of all disallow new sockets creation. */
1268         sock_unregister(PF_INET6);
1269         /* Disallow any further netlink messages */
1270         rtnl_unregister_all(PF_INET6);
1271 
1272 #ifdef CONFIG_SYSCTL
1273         ipv6_sysctl_unregister();
1274 #endif
1275         udpv6_exit();
1276         udplitev6_exit();
1277         tcpv6_exit();
1278 
1279         /* Cleanup code parts. */
1280         ipv6_packet_cleanup();
1281         ipv6_frag_exit();
1282         ipv6_exthdrs_exit();
1283         addrconf_cleanup();
1284         ip6_flowlabel_cleanup();
1285         ip6_route_cleanup();
1286 #ifdef CONFIG_PROC_FS
1287 
1288         /* Cleanup code parts. */
1289         if6_proc_exit();
1290         ipv6_misc_proc_exit();
1291         udplite6_proc_exit();
1292         raw6_proc_exit();
1293 #endif
1294         ipv6_netfilter_fini();
1295         igmp6_cleanup();
1296         ndisc_cleanup();
1297         ip6_mr_cleanup();
1298         icmpv6_cleanup();
1299         rawv6_exit();
1300 
1301         unregister_pernet_subsys(&inet6_net_ops);
1302 #ifdef CONFIG_SYSCTL
1303         ipv6_static_sysctl_unregister();
1304 #endif
1305         proto_unregister(&rawv6_prot);
1306         proto_unregister(&udplitev6_prot);
1307         proto_unregister(&udpv6_prot);
1308         proto_unregister(&tcpv6_prot);
1309 
1310         rcu_barrier(); /* Wait for completion of call_rcu()'s */
1311 }
1312 module_exit(inet6_exit);
1313 
1314 MODULE_ALIAS_NETPROTO(PF_INET6);
1315 

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